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waf-release-oct-13-2025 #25801
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| title: "WAF Release - 2025-10-13" | ||
| description: Cloudflare WAF managed rulesets 2025-10-13 release | ||
| date: 2025-10-13 | ||
| --- | ||
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| import { RuleID } from "~/components"; | ||
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| This week’s highlights include a new JinJava rule targeting a sandbox-bypass flaw that could allow malicious template input to escape execution controls. The rule improves detection for unsafe template rendering paths. | ||
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| **Key Findings** | ||
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| New WAF rule deployed for JinJava (CVE-2025-59340) to block a sandbox bypass in the template engine that permits attacker-controlled type construction and arbitrary class instantiation; in vulnerable environments this can escalate to remote code execution and full server compromise. | ||
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| **Impact** | ||
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| * CVE-2025-59340 — Exploitation enables attacker-supplied type descriptors / Jackson `ObjectMapper` abuse, allowing arbitrary class loading, file/URL access (LFI/SSRF primitives) and, with suitable gadget chains, potential remote code execution and system compromise. | ||
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| <table style="width: 100%"> | ||
| <thead> | ||
| <tr> | ||
| <th>Ruleset</th> | ||
| <th>Rule ID</th> | ||
| <th>Legacy Rule ID</th> | ||
| <th>Description</th> | ||
| <th>Previous Action</th> | ||
| <th>New Action</th> | ||
| <th>Comments</th> | ||
| </tr> | ||
| </thead> | ||
| <tbody> | ||
| <tr>SSTI | ||
| <td>Cloudflare Managed Ruleset</td> | ||
| <td> | ||
| <RuleID id="b327d6442e2d4848b4aab3cbc04bab5f" /> | ||
| </td> | ||
| <td>100892</td> | ||
| <td>JinJava - SSTI - CVE:CVE-2025-59340</td> | ||
| <td>Log</td> | ||
| <td>Block</td> | ||
| <td>This is a New Detection</td> | ||
| </tr> | ||
| <tr> | ||
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| </tbody> | ||
| </table> | ||
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